win_flowershop_auto

YARA detection rule by Felix Bilstein - yara-signator at cocacoding dot com

Detects win.flowershop.

rule win_flowershop_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.flowershop."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.flowershop"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    


    strings:
        $sequence_0 = { 83f8ff 7437 ff35???????? ff15???????? 85c0 7427 8935???????? }
                                                                                                
        $sequence_1 = { ff15???????? 8bf0 85f6 7429 ff7514 8b450c 83660800 }
                                                                                                
        $sequence_2 = { 8b45f4 a3???????? 8b4508 3b45f0 74e0 8945f0 6a08 }
                                                                                                
        $sequence_3 = { 7459 56 e8???????? 663dac3f 59 66a3???????? 7209 }
                                                                                                
        $sequence_4 = { 89510c c3 a1???????? 53 56 b9fc070000 668b30 }
                                                                                                
        $sequence_5 = { 894624 33c9 85c0 0f95c1 8bc1 5f 5e }
                                                                                                
        $sequence_6 = { be???????? 8b0e 8bc1 d1e8 83e003 83e800 0f84a8000000 }
                                                                                                
        $sequence_7 = { ebcc 53 56 8b74240c 33db 85f6 57 }
                                                                                                
        $sequence_8 = { 33c0 3806 5e 0f95c0 c9 c3 8b442404 }
                                                                                                
        $sequence_9 = { 56 6a28 6a00 68???????? e8???????? 8b742414 6a0f }
                                                                                                
    condition:
        7 of them and filesize < 829440
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

d97765aa-41cf-44aa-919a-8125dba1f5f3

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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